The world that never was in KH2 interested me the most because it had a dark feeling to its atmosphere.  

The world that never was and twilight town.

Twilight Town

Twilight Town, Beast's Castle, and DAYS edition of Wonderland.

The World That Never Was, it has a beauty, loneliness and emptiness to it I can relate to.

Castle Oblivion in re:coded

Twilight Town and Space Paranoids

Hollow Bastion in KH1.

The Keyblade Graveyard

The End of the World.

That's a tough one. I'd have to say Twilight Town, Traverse Town, The 100 Acre Wood, and Enchanted Dominion. It's lovely to see childhood places be brought to life ^^

Olympus Coliseum.

Twilight Town, KHII Hallow Bastion, The Grid, and The World That Never was

Traverse Town.  I love the quaint nightlife aspect to it.  It's a place I'd love to go for an evening out.

Port Royal .

Twilight Town, and Radiant Garden in BBS.

End Of The World in KH1=Trip mastery.

 

 

Nuff said, the music is litterally stuck in my head, and some of the best battles just take place there overall. Its so dark and edgy!!!! and...just.....freakin' amazing o_o;; i have no words

The Keyblade Graveyard. Some epic stuff went down there. Probably the most glorious war of all time.

Destiny Islands, Radiant Garden, TWTNW, Twilight town and The Land Of Departure.